220845 has 8 divisors (see below), whose sum is σ = 353376. Its totient is φ = 117776.

The previous prime is 220841. The next prime is 220859. The reversal of 220845 is 548022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 220845 - 2² = 220841 is a prime.

220845 is a lucky number.

It is a zygodrome in base 6.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220845.

It is not an unprimeable number, because it can be changed into a prime (220841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7347 + ... + 7376.

It is an arithmetic number, because the mean of its divisors is an integer number (44172).

2²²⁰⁸⁴⁵ is an apocalyptic number.

It is an amenable number.

220845 is a deficient number, since it is larger than the sum of its proper divisors (132531).

220845 is a wasteful number, since it uses less digits than its factorization.

220845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14731.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 220845 is about 469.9414857192. The cubic root of 220845 is about 60.4452980954.

Adding to 220845 its reverse (548022), we get a palindrome (768867).

The spelling of 220845 in words is "two hundred twenty thousand, eight hundred forty-five".